Airlines worldwide rely on the hub-and-spoke system to efficiently move thousands of passengers across the globe. What is a hub-and-spoke system? In short, hubs allow airlines and their alliance partners to fly into larger airports where passengers can be transferred to a smaller aircraft to reach their final destination. This is why you might fly through Frankfurt Airport (FRA) on your way to Stuttgart Airport (STR) or London’s Heathrow Airport (LHR) on your way to Manchester Airport (MAN). Understanding this system is critical to redeeming points and miles, so you can build itineraries even if award space isn’t available for your whole journey. Airport hubs and airline alliances CAMILO FREEDMAN/SOPA…